Department of Natural Resources, Faculty of Geo-Information Science and Earth Observation (ITC-NRS), University of Twente, Hengelosestraat 99, 7514 AE Enschede, The Netherlands
Department of Irrigation, Centro de Edafologia y Biologia Aplicada del Segura (CEBAS-CSIC) P.O. Box 164, E-30100 Espinardo, Murcia, Spain